I will forever laud Metamorpho simply for the inclusion of the actual formula HNO3 in Metamorpho #3 (Nov Dec 1965).
This is the earliest actual chemical formula that I’ve been able to identify in comics
If anyone has an earlier example please let me know!
The Periodic Table of Comic Books does reference an early Donald Duck comic which uses proper chemical notation but makes no sense.
https://www.uky.edu/Projects/Chemcomics/html/dd_15_2_c.html
I’m still looking for an earlier accurate formula than Metamorpho.